<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title></title>

  <link href="favicon.ico" rel="shortcut icon" class="icon-love" type="images/x-ico">

  <style>
    * {
      margin: 0;
      padding: 0;
      border: 0;
    }

    .icon-love {
      width: 400px;
    }

    html,
    body {
      width: 100%;
      height: 100%;
    }

    body {
      /*background-color: skyblue;*/
      overflow: hidden;
      /*隐藏超出的部分*/
    }

    .container {
      width: 100%;
      height: 100%;
      position: relative;
    }

    /*---------------------- body_left -------------------------*/
    .body_left {
      width: 300px;
      height: 300px;
      left: 0;
      bottom: 110px;
      position: absolute;
      z-index: 98;

    }

    /*---------------------- body_left -------------------------*/

    /*---------------------- body_center -------------------------*/
    .container .love {
      width: 520px;
      /* 13 * 40 */
      height: 440px;
      /* 11 * 40 */
      left: 50%;
      top: 50%;
      position: absolute;
      margin: -260px 0 0 -220px;
      /*background-color: gray;*/
    }

    .love .block {
      right: 0;
      position: absolute;
      visibility: hidden;
      /*未开始升空动画前隐藏*/
      background-color: yellow;
    }

    .love .block div {
      width: 40px;
      height: 40px;
      position: absolute;
      background: url("https://ruanjiafeng2013.gitee.io/shape/images/heart.png") no-repeat;
      background-size: contain;
      /*background-color: #c40908;*/
      /*border: 1px solid silver;*/
      box-sizing: border-box;
    }


    /*---------------------- body_center -------------------------*/

    /*---------------------- footer -------------------------*/
    @keyframes border {
      0% {
        width: 0;
      }

      5% {
        width: 5%;
      }

      10% {
        width: 10%;
      }

      15% {
        width: 15%;
      }

      20% {
        width: 20%;
      }

      25% {
        width: 25%;
      }

      30% {
        width: 30%;
      }

      35% {
        width: 35%;
      }

      40% {
        width: 40%;
      }

      45% {
        width: 45%;
      }

      50% {
        width: 50%;
      }

      55% {
        width: 55%;
      }

      60% {
        width: 60%;
      }

      65% {
        width: 65%;
      }

      70% {
        width: 70%;
      }

      75% {
        width: 75%;
      }

      80% {
        width: 80%;
      }

      85% {
        width: 85%;
      }

      90% {
        width: 90%;
      }

      95% {
        width: 95%;
      }

      100% {
        width: 100%;
      }

    }

    .footer {
      bottom: 30px;
      position: relative;
      z-index: 99;
    }

    .footer .border .border-top {
      /*width: 0;*/
      /*display: inline-block;*/
      border-top: 3px solid black;
      transform-origin: left center;
      -webkit-animation: border 312 linear;
      -o-animation: border 12s linear;
      animation: border 12s linear;
      animation-fill-mode: both;
      /*border-bottom: none;*/
    }

    .footer .border .border-bottom {
      /*width: 0;*/
      /*display: inline-block;*/
      float: right;
      border-top: 3px solid red;
      transform-origin: right center;
      -webkit-animation: border 7s linear 12s;
      -o-animation: border 7s linear 12s;
      animation: border 7s linear 12s;
      animation-fill-mode: both;
      /*border-bottom: none;*/
    }

    .footer .copyright {
      width: 100%;
      height: 30px;
      position: absolute;
      bottom: -30px;
      text-align: center;
      /*background-color: gray;*/

    }

    .copyright div {
      width: 30%;
      line-height: 30px;
      display: inline-block;
    }

    .copyright div span {
      color: dimgray;
    }

    /*---------------------- footer -------------------------*/
  </style>

</head>

<body>

  <div class="container" onselectstart="return false;" unselectable="on" style="-moz-user-select:none;">

    <div class="body_left">
      <img src="https://ruanjiafeng2013.gitee.io/shape/images/biubiubiu.gif" alt="" ondragstart='return false;'>
    </div>

    <div class="body_center love">
      <div class="block">
        <div class="div1"></div>
        <div class="div2"></div>
        <div class="div3"></div>
        <div class="div4"></div>
      </div>
    </div>

  </div>

  <div class="footer">
    <div class="border">
      <div class="border-top"></div>
      <div class="border-bottom"></div>
    </div>

  </div>

  <script type="text/javascript">


    const blk_pitn = { //各小方块相对【自身中心】的位置 -- 【自身中心】确定为#div22的方块
      block1: [[0, 1], [0, 0], [-1, 0], [-1, -1]],
      block2: [[0, 1], [0, 0], [-1, 0], [0, -1]],
      block3: [[-1, 1], [0, 0], [-1, 0], [-1, -1]],
      block4: [[0, 1], [0, 0], [-1, 0], [-1, -1]], /* 1 */
      block5: [[-1, 1], [0, 0], [-1, 0], [0, -1]],
      block6: [[0, -1], [0, 0], [-1, 0], [1, -1]],
      block7: [[-1, -1], [0, 0], [-1, 0], [1, 0]],
      block8: [[-1, 1], [0, 0], [-1, 0], [-1, -1]], /* 3 */
      block9: [[0, -1], [0, 0], [-1, 0], [1, 0]],
      block10: [[-1, 1], [0, 0], [-1, 0], [1, 0]],
      block11: [[2, 0], [0, 0], [-1, 0], [1, 0]], /* — */
      block12: [[0, 1], [0, 0], [-1, 0], [0, -1]], /* 2 */
      block13: [[0, 1], [0, 0], [-1, 0], [-1, -1]], /* 1 */
      block14: [[1, 1], [0, 0], [-1, 0], [1, 0]],
      block15: [[1, -1], [0, 0], [-1, 0], [1, 0]],
      block16: [[-1, -1], [0, 0], [-1, 0], [1, 0]], /* 7 */
      block17: [[0, 1], [0, 0], [-1, 0], [0, -1]], /* 2 */
      block18: [[0, 1], [0, 0], [-1, 0], [-1, -1]], /* 1 */
      block19: [[0, -1], [0, 0], [-1, 0], [1, 0]], /* 9 */
      block20: [[1, -1], [0, 0], [-1, 0], [1, 0]],
      block21: [[0, 1], [0, 0], [-1, 0], [-1, -1]], /* 1 */
      block22: [[1, 1], [0, 0], [-1, 0], [1, 0]], /* 14 */
      block23: [[0, 2], [0, 0], [0, -1], [0, 1]]      /* | */
    },
      offset_pitn = { //各方块block相对【爱心中心】的位置
        block1: [5, 3],
        block2: [5, 1],
        block3: [3, 4],
        block4: [3, 2],
        block5: [3, -1],
        block6: [2, 5],
        block7: [2, 1],
        block8: [1, -1],
        block9: [1, -3],
        block10: [1, 2],
        block11: [0, 3],
        block12: [0, 0], /* 【爱心中心】*/
        block13: [-1, -4],
        block14: [0, -2],
        block15: [-2, 4],
        block16: [-2, 2],
        block17: [-2, 0],
        block18: [-3, -2],
        block19: [-4, 0],
        block20: [-3, 5],
        block21: [-5, 3],
        block22: [-4, 1],
        block23: [-6, 1]    /* 因动画需要移动一个方块，故y轴坐标-1*/
      };

    let blocks = document.getElementsByClassName("block"),
      block = blocks[0],
      love = document.getElementsByClassName("love")[0],
      timer = null,
      index = 0,  //记录拼接爱心的动画步骤
      clone_block;    //用于克隆方块

    //1.移动方块的【自身中心】到【爱心中心】
    block.style.top = "50%";
    block.style.left = "50%";
    block.style.margin = "-20px 0 0 -20px";

    const block_left = parseFloat(window.getComputedStyle(block, null).left.slice(0, -2)), //【爱心中心】 左边距离父元素的距离
      block_top = parseFloat(window.getComputedStyle(block, null).top.slice(0, -2));  //【爱心中心】 顶部距离父元素的距离

    function Next() {
      if (++index >= 24) {
        clearInterval(timer);

        Rise();
        // alert("已经是最后一个了！");
        return;
      }

      block.style.visibility = "visible"; //升空动画前允许可见

      //2.移动方块到指定的位置-即是移动【自身中心】到目标位置
      block.style.left = block_left + 40 * offset_pitn["block" + index][0] + "px";
      block.style.top = block_top - 40 * offset_pitn["block" + index][1] + "px";
      for (let i = 0; i < block.children.length; i++) {
        // block.children[1].innerText = index;    //编号便于调试
        block.children[i].style.left = blk_pitn["block" + index][i][0] * -40 + "px";
        /* -40 是因为逻辑坐标和浏览器的x，y轴方向不一样*/
        block.children[i].style.top = blk_pitn["block" + index][i][1] * -40 + "px";
      }

      //3.克隆方块—保存现在的位置
      /* 一共会克隆23个方块，加上原先的一个方块block，共24个方块，即多出原先的block方块*/
      clone_block = block.cloneNode(true);
      love.appendChild(clone_block);

      if (love.children.length >= 24) {
        blocks[blocks.length - 1].children[2].style.display = "none"; //去掉多余的小方块
        block.style.display = "none";   //隐藏多出的block方块
      }
    }

    function Rise() {
      //4.爱心升高，多出的那个小方块开始掉落
      console.log("开始升空");
      let timer2 = null,
        distance = 0;
      /* 升高时，移动的距离*/
      const target = 120, /* 目标距离*/
        speed = 1;
      /*移动速度*/

      let love_top = parseFloat(window.getComputedStyle(love, null).top.slice(0, -2));  //爱心盒子距离屏幕顶部的距离


      timer2 = setInterval(() => {
        distance += speed;
        // console.log(distance);
        if (distance >= target) {
          clearInterval(timer2);

          console.log("升空完毕");

        }

        love.style.top = (love_top - distance) + "px";

      }, 22);

    }

    window.onload = function () {
      setTimeout(() => {

        timer = setInterval(() => {
          Next();
        }, 300);


      }, 12000);   //gif图播放完毕所需时间为11.73s
    };


  </script>
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</body>
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</html>
